From: "Kyösti Mälkki" <kyosti.malkki@gmail.com>
To: linux-usb@vger.kernel.org
Cc: linux-serial@vger.kernel.org, balbi@ti.com, gregkh@linuxfoundation.org
Subject: usb: gadget: Fixes to receive from USB EHCI Debug
Date: Mon, 3 Nov 2014 17:18:03 +0200 [thread overview]
Message-ID: <1415027885-2181-1-git-send-email-kyosti.malkki@gmail.com> (raw)
In-Reply-To: <1414346490-19307-1-git-send-email-kyosti.malkki@gmail.com>
USB gadget driver dbgp can be used as an EHCI debug dongle in replacement
for product like Net20DC. With it one can receive early kernel messages
from remote targets over USB. See parameter earlyprintk=dbgp for target
kernel requirements and configuration.
The two patches are required for dbgp gadget driver to work. Longterm
plan: I think G_DBGP_PRINTK is an odd hack and could be removed.
Exposing the debug descriptor can be implemented in cdc_acm so that we
could seemlessly reconfigure endpoint from the 8 byte payload limitation
EHCI Debug Port has, to 512 bytes, once ehci-hcd with DMA is available.
Handling of the termios CLOCAL flag calls for some discussion and I am
not that familiar with the tty infra u_serial uses. See the previous
change around gserial_disconnect():
http://permalink.gmane.org/gmane.linux.usb.general/4260
Regards,
Kyösti
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next prev parent reply other threads:[~2014-11-03 15:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1414346490-19307-1-git-send-email-kyosti.malkki@gmail.com>
[not found] ` <1414346490-19307-3-git-send-email-kyosti.malkki@gmail.com>
[not found] ` <1414346490-19307-3-git-send-email-kyosti.malkki-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-10-27 13:38 ` [PATCH 2/2] usb: gadget serial: Honour termios CLOCAL on disconnect Felipe Balbi
2014-10-27 15:43 ` Kyösti Mälkki
[not found] ` <544E680A.9010700-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-10-27 15:46 ` Felipe Balbi
2014-10-27 17:11 ` Peter Hurley
2014-11-03 15:18 ` Kyösti Mälkki [this message]
[not found] ` <1415027885-2181-1-git-send-email-kyosti.malkki-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-11-03 15:18 ` [PATCH v2 1/2] usb: gadget dbgp: Fix endpoint config after USB disconnect Kyösti Mälkki
[not found] ` <1415027885-2181-2-git-send-email-kyosti.malkki-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-11-07 18:04 ` Felipe Balbi
2014-11-03 15:18 ` [PATCH v2 2/2] usb: gadget serial: Honour termios CLOCAL on disconnect Kyösti Mälkki
[not found] ` <1415027885-2181-3-git-send-email-kyosti.malkki-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-11-03 15:33 ` Peter Hurley
[not found] ` <5457A062.50306-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2014-11-03 23:49 ` Kyösti Mälkki
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